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Synthesis method of 2-cyanopyridine

A technology of cyanopyridine and synthesis method, which is applied in the field of synthesis of 2-cyanopyridine, can solve the problem of low conversion rate of 2-picoline, and achieve the effect of easy operation and simple process

Inactive Publication Date: 2009-12-16
NANTONG ACETIC ACID CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Low conversion of 2-picoline

Method used

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  • Synthesis method of 2-cyanopyridine

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Embodiment Construction

[0022] The raw material 2-picoline and ammonia are vaporized and preheated to 180-330°C, then enter the mixer and mix with air evenly, and then distribute through the distributor on the upper part of the fixed bed reactor and then enter the fixed bed reactor filled with catalyst, controlled The reaction temperature is between 300-450°C, the pressure at the top of the reactor is controlled at 0.020-0.070KPa, the reaction temperature is controlled by molten salt, the reaction gas after the reaction is absorbed by water, and the 2-cyanopyridine content reaches 2-8% , and then extract and rectify to obtain the finished product 2-cyanopyridine. The molar ratio of the amount of raw materials is: 2-picoline: NH 3 : air=1:3-8:12-18. Described catalyzer is the 2-cyanopyridine ammoxidation catalyst that is carrier with silicon dioxide, and the composition of catalyzer is as follows:

[0023] A a B b C c Cr 10 o x

[0024] Wherein A=Na (or K or Ti or several combinations in Na, K...

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PUM

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Abstract

The invention discloses a synthesis method of 2-cyanopyridine, which is characterized in that 2-methylpyridine is vaporized and mixed with ammonia and air; the 2-methylpyridine reacts with the ammonia and air in the presence of a catalyst, and then the finished product of 2-cyanopyridine is obtained after absorption, extraction and rectification. The method features simple process and easy operation; the conversion rate of the 2-methylpyridine is more than 97% and the yield of the 2-cyanopyridine is more than 85%.

Description

Technical field: [0001] The present invention relates to a kind of synthetic method of 2-cyanopyridine. Background technique: [0002] The synthetic route of existing 2-cyanopyridine comprises: 1) adopt chemical synthesis method, increase cyano group on the 2-position by chemical reaction on pyridine ring, yield only has 52% according to literature report; 2) adopt ammoxidation In the method, the reactors used include fluidized bed and fixed bed, and the types of catalysts used are quite different. The conversion rate of 2-picoline is low. Invention content: [0003] The object of the present invention is to provide a kind of synthetic method of 2-cyanopyridine with simple technique and high yield. [0004] Technical solution of the present invention is: [0005] A method for synthesizing 2-cyanopyridine, which is characterized in that 2-picoline is vaporized, mixed with ammonia and air, reacted in the presence of a catalyst, and then absorbing, extracting and rectifyin...

Claims

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Application Information

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IPC IPC(8): C07D213/84B01J23/26B01J23/04B01J23/02B01J21/06B01J23/22B01J23/34B01J23/86B01J23/88B01J23/85B01J23/78B01J23/80
Inventor 丁彩峰朱小刚刘芳周新建薛建锋
Owner NANTONG ACETIC ACID CHEM
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